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Extragalactic background light: a measurement at 400 nm using dark cloud shadow – II. Spectroscopic separation of the dark cloud’s light, and results★

机译:刷新背景灯:使用乌云阴影 - II的400nm测量。乌云光的光谱分离,以及结果★

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摘要

In a project aimed at measuring the optical extragalactic background light (EBL), we are using the shadow of a dark cloud. We have performed, with the ESO VLT/FORS, spectrophotometry of the surface brightness towards the high-galactic-latitude dark cloud Lynds 1642. A spectrum representing the difference between the opaque core of the cloud and several unobscured positions around the cloud was presented in Paper I. The topic of this paper is the separation of the scattered starlight from the dark cloud itself which is the only remaining foreground component in this difference. While the scattered starlight spectrum has the characteristic Fraunhofer lines and the discontinuity at 400 nm, typical of integrated light of galaxies, the EBL spectrum is a smooth one without these features. As template for the scattered starlight, we make use of the spectra at two semitransparent positions. The resulting EBL intensity at 400 nm is I-EBL = 2.9 +/- 1.1 10(-9) erg cm(-2) s(-1) sr(-1) angstrom(-1) or 11.6 +/- 4.4 nW m(-2) sr(-1), which represents a 2.6 sigma detection; the scaling uncertainty is +20 per cent/-16 per cent. At 520 nm, we have set a 2 sigma upper limit of I-EBL
机译:在一个旨在测量光学刷新背景灯(EBL)的项目中,我们正在使用暗云的阴影。我们已经用ESO VLT / FORS进行了,表面亮度的分光光度法朝向高热纬度暗云云Lynds 1642。表示云的不透明核心与云周围的几个视野的位置之间的频谱。纸质I.本文的主题是分离散射星光从暗云本身的分离,这是唯一剩余的前景组成部分。虽然散射的星光谱具有特征性的Fraunhofer系和400nm的不连续,但典型的星系集成光线,EBL光谱是光滑的,没有这些特征。作为散射星光的模板,我们在两个半透明位置使用光谱。在400nm处产生的EBL强度是I-EBL = 2.9 +/- 1.1 10(-9)ERG CM(-2)S(-1)SR(-1)埃(-1)埃(-1)或11.6 +/- 4.4 NW M(-2)Sr(-1),表示2.6 sigma检测;扩大的不确定性是+20%/ -16%。在520 nm,我们已经设定了I-EBL的2 SIGMA上限

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